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74112 - Dual J-K Negative Edge-Triggered Flip-Flop

Overview

The 74112 is a high-speed, dual J-K negative edge-triggered flip-flop integrated circuit. It is part of the 7400 series of TTL logic devices and is widely used in digital electronics for sequential logic applications. Each flip-flop has individual J, K, clock (CLK), preset (PRE), and clear (CLR) inputs, with complementary outputs (Q and Q̅). The device is designed for reliable operation in high-speed counting, data storage, and synchronization applications.

Features

• Dual J-K Flip-Flops: Contains two independent J-K flip-flops in a single package.
• Negative Edge-Triggered: State changes occur on the high-to-low transition of the clock signal.
• High-Speed Operation: Optimized for fast switching and propagation delays, making it suitable for high-frequency applications.
• Asynchronous Inputs: Includes preset (PRE) and clear (CLR) inputs for immediate control over the output state, independent of the clock.
• Wide Operating Voltage: Compatible with standard TTL voltage levels (4.75V to 5.25V).
• Complementary Outputs: Provides both true (Q) and inverted (Q̅) outputs for flexible logic design.
• Robust Design: High noise immunity and reliable performance under varying environmental conditions.

Applications

The 74112 is versatile and finds use in a variety of digital systems, including:

• Counters and Registers: Used in ripple counters, shift registers, and other sequential circuits.
• Data Synchronization: Ensures stable data transfer between asynchronous systems by synchronizing input signals.
• Frequency Division: Divides clock frequencies in digital timing circuits.
• State Machines: Implements finite state machines for control logic in digital systems.
• Memory Units: Acts as a basic storage element in buffer and latch applications.
• Pulse Shaping: Modifies pulse waveforms in signal processing circuits.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): 7V
• Input Voltage (V_IN): 5.5V
• Operating Temperature Range: 0°C to +70°C (commercial grade)
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 4.75V to 5.25V
• High-Level Input Voltage (V_IH): 2V (min)
• Low-Level Input Voltage (V_IL): 0.8V (max)
• Clock Frequency (f_CLK): Up to 30MHz (typical)

Dynamic Characteristics

• Propagation Delay (CLK to Q): 20ns (max)
• Setup Time (J or K to CLK): 20ns (min)
• Hold Time (J or K after CLK): 0ns (min)
• Rise/Fall Time: 10ns (typical)

Package Information

The 74112 is available in multiple package options to suit different assembly and space requirements:

• PDIP (Plastic Dual In-Line Package): 16-pin, 0.3" row spacing, through-hole mounting.
• SOIC (Small Outline Integrated Circuit): 16-pin, surface-mount package with 0.05" pin spacing.
• TSSOP (Thin Shrink Small Outline Package): 16-pin, ultra-thin profile for high-density PCB designs.

Pin Configuration

The pinout for the 74112 (16-pin package) is as follows:

• Pin 1: CLR1 (Clear Input for Flip-Flop 1)
• Pin 2: CLK1 (Clock Input for Flip-Flop 1)
• Pin 3: K1 (K Input for Flip-Flop 1)
• Pin 4: J1 (J Input for Flip-Flop 1)
• Pin 5: PRE1 (Preset Input for Flip-Flop 1)
• Pin 6: Q1 (Output Q for Flip-Flop 1)
• Pin 7: Q̅1 (Complementary Output Q̅ for Flip-Flop 1)
• Pin 8: GND (Ground)
• Pin 9: Q̅2 (Complementary Output Q̅ for Flip-Flop 2)
• Pin 10: Q2 (Output Q for Flip-Flop 2)
• Pin 11: PRE2 (Preset Input for Flip-Flop 2)
• Pin 12: J2 (J Input for Flip-Flop 2)
• Pin 13: K2 (K Input for Flip-Flop 2)
• Pin 14: CLK2 (Clock Input for Flip-Flop 2)
• Pin 15: CLR2 (Clear Input for Flip-Flop 2)
• Pin 16: V_CC (Supply Voltage)

Functional Description

The 74112 operates as a negative edge-triggered J-K flip-flop, meaning the output state changes only when the clock signal transitions from high to low. The J and K inputs determine the next state of the flip-flop according to the following truth table:

• J=0, K=0: No change (output retains previous state).
• J=0, K=1: Reset (Q=0, Q̅=1).
• J=1, K=0: Set (Q=1, Q̅=0).
• J=1, K=1: Toggle (output switches to the opposite state).

The asynchronous preset (PRE) and clear (CLR) inputs override the clock and J/K inputs, allowing immediate control of the output state. These inputs are active-low, meaning a low signal forces the output to the desired state.

Conclusion

The 74112 is a reliable and high